Viable influenza A virus in airborne particles expelled during coughs versus exhalations

Details

• Alternative Title:
  Influenza Other Respir Viruses
• Personal Author:
  Lindsley, William G. ; Blachere, Francoise M. ; Beezhold, Donald H. ; Thewlis, Robert E. ; Noorbakhsh, Bahar ; Othumpangat, Sreekumar ; Goldsmith, William T. ; McMillen, Cynthia M. ; Andrew, Michael E. ; Burrell, Carmen N. ; Noti, John D.
• Description:
  Background
  
  To prepare for a possible influenza pandemic, a better understanding of the potential for the airborne transmission of influenza from person to person is needed.
  
  Objectives
  
  The objective of this study was to directly compare the generation of aerosol particles containing viable influenza virus during coughs and exhalations.
  
  Methods
  
  Sixty‐one adult volunteer outpatients with influenza‐like symptoms were asked to cough and exhale three times into a spirometer. Aerosol particles produced during coughing and exhalation were collected into liquid media using aerosol samplers. The samples were tested for the presence of viable influenza virus using a viral replication assay (VRA).
  
  Results
  
  Fifty‐three test subjects tested positive for influenza A virus. Of these, 28 (53%) produced aerosol particles containing viable influenza A virus during coughing, and 22 (42%) produced aerosols with viable virus during exhalation. Thirteen subjects had both cough aerosol and exhalation aerosol samples that contained viable virus, 15 had positive cough aerosol samples but negative exhalation samples, and 9 had positive exhalation samples but negative cough samples.
  
  Conclusions
  
  Viable influenza A virus was detected more often in cough aerosol particles than in exhalation aerosol particles, but the difference was not large. Because individuals breathe much more often than they cough, these results suggest that breathing may generate more airborne infectious material than coughing over time. However, both respiratory activities could be important in airborne influenza transmission. Our results are also consistent with the theory that much of the aerosol containing viable influenza originates deep in the lungs.
  
  
• Subjects:
  Adult Aerosols Air Microbiology Cough Exhalation Female Humans Influenza, Human Influenza A Virus Male Microbial Viability Pandemics RNA, Viral Spirometry Virus Replication Young Adult

  More +
• Source:
  Influenza Other Respir Viruses. 10(5):404-413.
• Pubmed ID:
  26991074
• Pubmed Central ID:
  PMC4947941
• Document Type:
  Journal Article
• Volume:
  10
• Issue:
  5
• Collection(s):
  CDC Public Access
• Main Document Checksum:
  urn:sha256:18b560a4e75342514a53885e7474923c27e3d0714e500b4d4aef8a0507a3c4ff
• Download URL:
  https://stacks.cdc.gov/view/cdc/41381/cdc_41381_DS1.pdf
• File Type:
  [PDF - 286.89 KB ]